The chain is the heart of the Eagle drive train, completely re-engineered for 1x systems and the innovative X-Sync 2 chainrings. It offers longer wear with less friction and less noise than previous SRAM chains. -Flowlink design eliminates square edges on outer plates to reduce friction and wear -Recessed chain rivet contact area allows ultra-high joining strength with zero pin protrusion -PowerLock non-reusable connecting link is included